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Capped carbon nanotube, molecular model. It is called capped because the ends of the tubes have been rounded off to form an enclosed structure. This molecule is a type of fullerene, a structural type (allotrope) of carbon. Its carbon atoms are arranged in a structure consisting of interlinking hexagonal and pentagonal rings. Theoretically, a wide range of shapes can be engineered at the molecular level using fullerenes. Such structures could have a wide range of technological and medical uses.